520006521 has 16 divisors (see below), whose sum is σ = 709694336. Its totient is φ = 338587776.

The previous prime is 520006499. The next prime is 520006541. The reversal of 520006521 is 125600025.

It is not a de Polignac number, because 520006521 - 2⁶ = 520006457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520006541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11031 + ... + 34083.

It is an arithmetic number, because the mean of its divisors is an integer number (44355896).

Almost surely, 2^520006521 is an apocalyptic number.

It is an amenable number.

520006521 is a deficient number, since it is larger than the sum of its proper divisors (189687815).

520006521 is a wasteful number, since it uses less digits than its factorization.

520006521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23232.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 520006521 is about 22803.6514839181. The cubic root of 520006521 is about 804.1485131336.

Adding to 520006521 its reverse (125600025), we get a palindrome (645606546).

The spelling of 520006521 in words is "five hundred twenty million, six thousand, five hundred twenty-one".